2 X Faithal pro 5FE120 -8 reach 115 dB max SPL, so still 111 dB is "the weakest in the chain"
What kind of waveguide is this? Do you have any measurements? I don't see anything for this audax on the internet.
It was Dave Pellegrene how made this for the Audax TW025A28 (Gold), and it ended up at my house.
Here is the tread and mesaurements.
https://techtalk.parts-express.com/.../59178-audax-tw025a28-testing-with-waveguides
Regards john